13 Sep 1944HMS Venturer (Lt. J.S. Launders, DSC, RN) fires 3 torpedoes against the Norwegian merchant Force (499 GRT, offsite link) north-west of Egersund, Norway. All three torpedoes missed their target. Venturer then engaged the target with gunfire but the submarine was forced to break off this attack as she was fired upon by German shore batteries.

11 Nov 1944HMS Venturer (Lt. J.S. Launders, DSC, RN) torpedoed and sank German U-boat U-771 in the Andfjord about 7 nautical miles east of Andenes, Norway, in position 69°17'N, 16°28'E.

9 Feb 1945HMS Venturer (Lt. J.S. Launders, DSO, DSC, RN) torpedoed and sank German U-boat U-864 in the North Sea west of Bergen, Norway, in position 60°46'N, 04°35'E. This is the only known incident in all of naval warfare in which one submarine sank another while both are submerged.